Brute Platinum Maintenance Reamer Set includes: 3/8", 1/2", 5/8", 3/4"and are made of HSS, with a 1/2" Straight Shank, Left hand Helix and a Right Hand Cut. Similar in design to a bridge reamer but with shorter flutes and overall lengths. Engineered exclusively to enlarge and align existing holes; especially in tight spots where bridge reamers cannot enter.