TradeQuip "Made for the Trade" Adjustable Jack Stands are ideally suited to the professional trade workshop. These ratchet type axle stands are designed with a cast iron support post, tough steel plate welded base and deep saddle for positive location under the vehicle. The cast iron post is equipped with angled teeth and a double-lock safety pin to prevent accidental release of load - the more weight applied, the tighter the post is locked. It's easy to get complacent about yours and your employees' safety when you have years of experience, however accidents can happen to anyone. Although garage and bottle jacks can lift heavy loads they are not designed to keep them there, so when the vehicle has been jacked up it's crucial that it is placed on a jack stand. TradeQuip jack stands are excellently designed to ensure you maximum safety. They have wide feet providing a strong base and a unique locking pin so there is no risk of them slipping. ALWAYS chock the vehicle wheels and use jack stands.