Stanley Proto has expanded its line of extracting tools to include two additional choices. The External Cam/Knurl-Type Stud Extractor has a knurled wheel inside which grips studs for easy loosening. It's ideal for bolts with rusted, corroded or stripped threads, and can be turned with a wrench or ratcheting tool. It comes with either a 1/2" or 3/4" drive, and can loosen studs ranging in diameter from 5-27 mm and 3/16" to 2-5/16". The Internal Cam/Roller-Type Stud Extractor is designed to reduce the chance of slippage as more pressure is applied. The tool has a 1/2" drive, is available in eight sizes and can be used on stud diameters ranging from 6-16 mm and 1/4" to 5/8".