1 1/4-7 x 13 Socket Cap Screw Alloy

Double spiral

The nylon flange head adds stability in hollow surfaces

2-4 1/2 x 15 Socket Cap Screw Alloy

10 x 3 Simpson Bugle-Head Self-Drilling Screw - Square Drive 410 SS - Carton (1500) Square Flat-Head Self Drilling Screws with Wings 410 Stainless Steel 1 1/4-7 x 13 Socket10 x 3 Simpson Bugle Head Self Drilling Screw Square Drive 410 SS Carton (1500) . Fasten wood, plywood and OSB panels to steel studs #2 square drive bugle heads drive flush with work surface Tapping screw threads, #3 drill points Drilling thickness capacities: up to . 083" (68 mils, 14 ga.) for #6, up to . 142" (118 mils, 10 ga) for #8 and up to . 177" for #10