Fits Bosch 11387, 11247, 11248EVS - PLEASE CHECK YOUR HAMMERS VERY CAREFULLY BEFORE PURCHASE Round hex shank – One-piece machined construction with a 2.75’’ long 1’’ ID Drive Socket One-piece design - saves a lot of pounding with a manual hammer guaranteed easy installation of ground rods. Hardened steel body for increased durability –tool hardness specification of 45-55 Rockwell C Perfect for commercial and industrial applications - used for installing ground rods, parking bumper stakes, etc. (1 Year Guarantee or Full Refund. No Matter What.)