Magnum 44, 5 Piece, Carbide SDS Bit, Assorted, Includes 3/16 x 4", 1/4" x 6", 5/16" x 6", 3/8" x 6" & 1/2" x 6" SDS Bits, For All Rotary Hammers, Unique Tip Geometry & 4 Flute Design Combine To Provide Up To 25% Longer Drilling Life & Faster Cutting. Design Allows Easier Centering, More Bit Strength & Lower Vibration To Provide User Comfort & Bit Durability.