Professional 4 in 1 chuck key Universal chuck key to replace lost or damaged chuck keys Suitable for nearly all drills and power tools Manufactured from chemically blackened zinc alloy for strength and durability Suitable for the following size chucks - 1/4", 3/8", 1/2" and 5/8" One item four different sizes A universal chuck key for most drills whether electric / battery or air SUITABLE FOR THE FOLLOWING CHUCK SIZES • 1/4" Chucks • 3/8" Chucks • 1/2" Chucks • 5/8" Chucks