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Four double edged cutting/gripping sides.8-Points of contact to make non-slip engagement, the bolt/screw.Ensures removal of even the toughest bolts/screws.Supplied in storage case.Contents: #1; 3.2-4.2mm, #2; 4.8-7.1mm, #3; 6.4-9.5mm, #4; 8.7-12.7mm, #5; 11.1-15.9mm.Warranty: 1 year