Irwin 1859143 Impact Bolt Grip Deep Well Bolt Extractor Set, 6-Piece Portable and the other side is

and the other side is fluted

Fiber trapping rings are designed to prevent mushrooming and dimpling

Slim body for a secure grip

No mitering decorative blocks

Irwin 1859143 Impact Bolt Grip Deep Well Bolt Extractor Set, 6-Piece Portable and the other side isHighlights: IMPACT performance series bits don't just work with impact drivers. They are designed specifically for them and the higher torque they produce Reverse spiral flutes grip harder as resistance increases for maximum grip power Constructed of premium high carbon steel for durability and extended drilling life. Black oxide finish resists corrosion Universal lobular design fits all types of fasteners. Square drive fits impact wrenches, or drills