MTP 4 Way Chuck Key Drill Press 1/4" 3/8" 1/2" 5/8" Universal Combination #1 , #2, #3 - #4 4 way chuck key small: 1, 2, 3, 4 Dropped forged alloy steel. Chuck Sizes: 6mm 9mm 10mm 13mm size:7.5cm * 7.5cm