Instantly convert impact driver to hold non-quick change drill & driver bits. Keyless chuck finger-tightens for easy bit changes. Greater clamping force, effectively preventing drill bits loose off, more reliable. Quick-change SDS shank for electric hammer. Mount:1/2-20UNF. Specifications: Material: Chrome vanadium steel and plastic Shank length: 46mm for Head diameter: 42mm Capacity: 2-13mm Size: 122 x 42mm（One centimeter error is within the normal measurement range） Package includes: 1 x SDS chuck adapter
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