640498 Features: -Socket.-Center hole punched for added work depth.-Chamfered opening for easier mating to fasteners.-Meets and exceeds ANSI standards.-Size: 0.15", 0.19", 0.23", 0.27", 0.31", 0.35", 0.39", 0.43", 0.47", 0.51" and 0.55". Dimensions: -Product weight: 0.54 lb.