Hardened steel screws and cast steel claws. 2 Legged Central hexagonal drive with wrap over coil claws which can be reversed for spreading applications. Suitable for use on cars and light commercial vehicles. Use with 21mm/13/16 AF open ended spanner. Maximum jaw opening: 250mm. 3 Legged Each leg has one free moving claw and one threaded claw with a 1/2 square drive or 24mm hexagon drive - can be used with air tools or spanners. Fitted with safety hooks to prevent accidental release. Suitable for use on cars and commercial vehicles and allows safe compression of heavier springs. Maximum jaw opening: 240mm.