On diameters over 2 1/2 inches

" locking the anchor on the wall

5/8-11 x 9 1/2 Socket Cap Screw Alloy

1 3/8 Flat Washer SS 18-8 (A2)

#1 Heavy Duty Drill Bit - Stubby Length

7 x 1 5/8 Simpson Trim-Head Self-Drilling Siding Screw - Square Drive 410 SS - Carton (5000) #10 Square Bugle-Head Wood Decking Screws T17 316 Stainless Steel On diameters over 2 1/27 x 1 5 8 Simpson Trim Head Self Drilling Siding Screw Square Drive 410 SS Carton (5000) . Attach wood siding, wood panels and metal trim to steel studs #1 square drive trim head, . 230" head diameter, #3 drill point Threaded 2 3 of overall length Drilling thickness capacity: up to 0. 125" (111 mils or 11 ga.)