5/16-Inch Magnetic Hex Head Driver Bit w/Quick Change Shank - Used for Installing Screws, Nuts, Bolts, etc. - Commonly Used for Metal Roofing Screws (EACH) - Amazon.com
5/16x4 in. GRK RSS Washer Hd Structure, 305 SS, Star-Qty:45
Machine Screws 5/16"-18 X 5/8" Flat Head Tamper-Resistant Hex Socket Pin Drive Stainless Steel USA TR041
4-40 × 5/16" Screw for Bit Holder Track - Lee Valley Tools
5/16" Impact Hex Bit (Standard Bolt Size) – Setter Closet
5/16" Screw Machine Length Drill Bit 135° pt. - 6 per Pack | K.L. Jack