#9 x 1-1/4 in. and 1-5/8 in. Serrated Flat Head Star Drive Cement Board Screws Combo Kit (185-Pack, 140-Pack)

The Backer-On 1-5/8 in. Cement Board Screws are designed for attaching HardieBacker or equivalent fiber cement backerboard to wood or light gauge steel studs. The Rock-On 1-1/4 in. Cement Board Screws are designed for attaching Durock, Wonder board or equivalent glass-mesh cement backerboard to wood or light gauge steel studs. Backer-On’s and Rock-On’s patented serrated head design countersinks for flush seating at any angle, providing a smooth surface for tile. The Star drive recess with T-25 bit provides StikfitTM for 1-handed installation. Backer-On and Rock-On screws feature a Climacoat corrosion resistant finish that prevents rust from bleeding into grout and are perfect for use in high moisture areas such as baths, showers, countertops and floors. Conforms to ANSI A108.11 for cement board attachment. Backer-On and Rock-On screws can be installed with a standard impact or drill/driver and T-25 Star drive bit (included with product) for cement board fastening done right.”,”highlights”:[“Seats flush even when driven at an angle”,”One handed installation (includes T-25 star drive bit)”,”Immediate pick-up into cement board”

Drive Style:Torx

Fastener Color:Green

Fastener Material:Carbon Steel

Fastener Plating:Zinc

Fastener Type:Cement Board Screws

Features:Self Tapping

Head Style:Flat Head

Included:Driver Bit

Interior/Exterior:Interior

Measurement Standard:ANS

Package Quantity:325

Product Weight (lb.):2.30 lb

Returnable:90-Day

Thread Style:Hi-Lo

Manufacturer Warranty:ITW Brands warrants that this product is free from defects in material and workmanship. ITW Brands’ sole liability for any breach of this warranty shall be to replace this product or refund the purchase price.

Screw Length:1-5/8 in

Size:#9

Thread Pitch (mm):2.6 mm

Threads Per Inch (TPI):9.8