This is the Du-Bro Nylon Wing Mounting Kit. FEATURES: All the hardware needed to make a bolt on wing. Nylon mounting blocks. Nylon wing bolts. Metal washers, nuts and screws. Screws have a slotted drive insert. INCLUDES: (2) Blocks (4) Screws (2) Wing Bolts (4) Nuts (2) Wing Bolt Washers (4) Lock Washers (4) Flat Washers SPECS: Nylon wing bolts- Length: 2" Thread: 1/4-20 Wing bolt washer- Diameter: 1/4" Mountng blocks- Thread: 1/4-20 Screws- Thread: 4-40 Nuts- Thread: 4-40 REQUIRES: 3/32" Drill Bit 1/4" Drill Bit RhB 061494