Weaver 8-40 Sight Screw Counterbore

Overall 2A 1/2'''' (6.3mm); Body Dia. .250'''' (6.3mm); Pilot Dia. .165'''' (4.2mm); Pilot Length 1/8'''' (3.2mm); 45deg Shoulder. Use Drill No. 19 for Pilot Hole. Mfg: Brownells