Bit Extension, Steel, Drive Size 1/4 In. , Shank Size 1/4 In. , Length 3 In. , The 1/4 In. Universal QUIK-LOK(TM) Extension Has An Innovative Design That Fits All 1/4 In. Shanks, with or Without A Power-Groove, The Unique Design Requires No Tools to Change Out Bits, Making It Fast and Efficient, Retainer Type QUIK-LOK(TM), Number of Pieces 1