Professional tool for commercial or occasional use Stud extractor set Designed to remove broken studs and bolts Multi spline extractors to remove broken studs, pipes, set screws, grease fittings Suitable for use with a 3/8" or 1/2" drive ratchet This precision kit allows you to extract bolts which are corroded r seized and need to be removed without damaging the casing or thread Manufactured from chrome hardened steel for maximum durability Will easily bite into and grip the softer bolts Full length flutes provide easier extractor starting As well as used by a ratchet a spanner can be used on hexagon shaped ends Left hand spiral design for extra gripping power SET INCLUDES THE FOLLOWING SIZES - 3/8" DRIVE - 2mm / 3mm / 4mm / 5mm and 6mm - 1/2" DRIVE - 8mm / 10mm / 12mm and 14mm SIMPLE TO USE - Firstly, drill a hole in the fastener - Choose a suitable bolt extractor and insert into the hole - Use a ratchet or spanner to turn the bolt extractor anticlockwise for easy and effective removal or broken items Comes on a rail for easy storage and transportation