Impact Screw And Extractor Set. Loosens Rusted Or Tightened Screws, Nuts And Bolts. Forward And Reverse Ratcheting. Heavy-Duty, Alloy Steel Bits. Contents: 1 X 1/2" Dr. Impact Driver, 1 X 1/2" Dr. X 5/16" Bit Holder, 5 X Screw Extractor Bits: #1 (M3~M6), #2 (M6~M8), #3 (M8~M11), #4 (M11~M14), #5 (M14~M19), 5 X 5/16" Bits, 2 X Phillips (36Mm): #2, #3, 2 X Slotted (36Mm): 8Mm, 10Mm, 1 - Phillips (80Mm): #2