For use with all 1/4" hex shank bits. Tool-less quick change - no hex key needed. Hardened shank for maximum durability. No. 48-28-1000: Length: 3 In., Shank Diameter: 1/4 In. Hex, Magnetic: No No. 48-28-1010: Length: 6 In., Shank Diameter: 1/4 In. Hex, Magnetic: No No. 48-28-1020: Length: 12 In., Shank Diameter: 1/4 In. Hex, Magnetic: No