IRWIN 10504634 Bolt Grip Fastener Remover Base Set of 5 Set includes plastic case. 5 Piece Bolt-Grip Expansion Set, includes sizes 8mm(5/16"), 10mm, 13mm, 11/16" 19mm(3/4") IRWIN 10504635 Bolt Grip Fastener Remover Expansion Set of 5 Sizes: 5/16in, 10mm, 13mm, 11/16in and 3/4in.

Irwin 10 Piece Bolt Grip Base Fastener Nut Remover Base Set

So, here's my thoughts about the prep work required prior to putting pressure on to release the bolt. During that time I've bought many "wonder tools" that claim to be able to extracted rusty, shredded nuts/bolts, but this is the first one that I have bought that:The gripper relies upon a rotary action, so hammering it into position will likely damage the tool and reduce grip, however a tap to ensure it is seated square may help. When you are faced with a rounded-off, rusted-tight or painted-over bolt, bolt extractors will break it free. This listing is for the 10504634 base set and the 10504635 expansion set to cover the full range of sizes. The reason I'm posting isn't to praise this product, because many have already done so, but to share my experience of using the tool, in the hope that it helps others faced with the potentially expensive job of removing a bad bolt. Apply WD40 penetrating fluid to all accessible ends of the bolt , let it sink in, then apply again (repeat every 10 mins for a couple of hours at least). If you can leave it overnight, even better. You are looking for a penetration into the bolt thread, not a soaked drip off the bolt. The time spent doing this is going to be a lot less than if you have to get a mechanic to finish the job.

BOLT-GRIP™ Bolt Extractors - Tools - IRWIN TOOLS

When you are faced with a rounded-off, rusted-tight or painted-over bolt, bolt extractors will break it freeI opted for a 3/8 extension bar in to a 3/8/ to 1/2 inch convertor, then used a 1/2 inch extendable ratchet to obtain the MINIMUM turning force required to release the bolt. Set include bolt extractors to remove bolts sizes: 8mm, 10mm, 13mm, 19mm, 5/16", 11/16", 3/4" in drive size 3/8"