Overall Length: 14"Max Drill Bit Size: 3/4"Max Core Bit Size: 3-1/8"For Use On Bosch SDS-Plus Hammers 11253VSR, 11255VSR, RH228VC, RH328VC/VCQ, RHH181-01, 11536-C And 11536VSRProvides Excellent Dust Collection When DrillingAttachment Has A Metal Telescoping Arm For Precise Retraction And Can Accommodate Up To 4-3/4" Drilling Depth, And Can Be Adjusted Forward Or Back With A Clamping Band To Accommodate A Variety Of Bit LengthsDust Port Can Be Hooked Up To 1-3/8" Vacuum Hose Nozzle Or 1-1/4" And 2" Nozzles When Combined With An Appropriate Optional Adapter