Does this work on 12 inch siding

No, neither the SA902 nor SA903 work on 12" siding. There is a model SA902.12 that is made specifically for use on the 12". It is basically the model SA902 with a pair of long aluminum extensions included in the package. Since this model is made of aluminum it isn't recommended for use on the pre-finished siding as the aluminum tends to leave marks.

What makes this zone 10 specific?

http://www.jameshardie.com/dealer/hardiezone.shtml + http://www.jameshardie.com/homeowner/hardiezone-video.htmlThe Zone 1 - 5 product has a specific drip edge design and since this tool clamps at that edge, you use it on zone 6 - 10 products.

Would these work installing the big 0.312-in x 48-in x 96-in hardiepanel vertical fiber cement siding panels?

These are for panel siding … clamps to Z Flashing to hold up the panel. https://www.amazon.com/dp/B001PBJ6QM?tag=price125420e-20&ascsubtag=wtbs_60358245085322c828fd7606

Will this work with 1in by 8in cedar bevel ?

Probably not. It’s only for 5/16 siding

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PacTool Gecko Gauge, The Original Home Siding Installation Kit - For Use with 5/16 Inch Fiber Cement Siding and James Hardie Siding, Includes 2 Gecko Gauge Clamps

PacTool Gecko Gauge, The Original Home Siding Installation Kit - For Use with 5/16 Inch Fiber Cement Siding and James Hardie Siding, Includes 2 Gecko Gauge Clamps

Product ID: 3319615

Details

Brand
PacTool
Color
Green
Item Weight
1.3 pounds
Item dimensions L x W x H
12 x 12 x 16
Material
Plastic Rubber
Number of Items
2

📏Adjusts in 1/4-inch increments (4-8 inch reveals)

🔒Non-marring rubber grip protects siding

🛠️50% faster one-person install

₨2735

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Description

🦎 Nail it solo, nail it perfect — the Gecko Gauge revolutionizes siding installation!

PRECISION EVERY TIME - Adjustable in 1/4-inch increments for perfect 4 to 8-inch siding reveals, ensuring flawless alignment.
HANDS FREE EFFICIENCY - Patented friction-cam mechanism supports full 12-foot fiber cement boards for steady, hands-free nailing.
TRUSTED CRAFTSMANSHIP - PacTool’s decades of innovation empower pros and DIYers to install siding faster, cleaner, and with less fatigue.
WORK SOLO WORK SMART - Pro Grip Clamp enables 50% faster, one-person siding installation with zero layout hassle.
PROTECT YOUR INVESTMENT - Durable plastic body with rubber locking grips prevents scratches on primed or pre-finished siding surfaces.

The PacTool Gecko Gauge SA903 is a professional-grade siding installation kit designed for 5/16-inch fiber cement and James Hardie siding. Featuring adjustable clamps with patented friction-cam technology, it supports up to 12-foot boards for hands-free, precise nailing. Its rubber-padded grips protect pre-finished siding from damage, enabling one-person installation that’s 50% faster and more accurate. Sold as a 2-piece set, this durable tool is trusted by pros and DIYers alike to streamline siding projects with less fatigue and superior results.

Specifications

ASIN	B000VERBCU
Best Sellers Rank	#7,963 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #3 in Siding Building Material
Brand Name	PacTool
Color	Green
Customer Reviews	4.8 4.8 out of 5 stars (6,073)
Included Components	Gecko Gauges
Item Dimensions	12 x 12 x 16 inches
Item Type Name	Siding Gecko Gauge
Item Weight	1.3 pounds
Manufacturer	General Tools & Instruments
Manufacturer Part Number	SA903
Manufacturer Warranty Description	Warranty
Material Type	Plastic, Polycarbonate, Rubber
Model Number	SA903
Set Name	Gecko Gauge Clamp Set (2 Piece)
Style Name	STANDARD
UPC	716080054214 732454522523 733353408949 787721689317 740528465270 645646903003 637825901672 785533916348 785479700438
Unit Count	1 Count

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