1" Spring loaded alligator clamping mechanism used for clamping files, stones and diamonds to the dedicated side edge file guides. A more efficient set-up for tuners who are utilizing a diamond-file-stone progressive approach to their edge tuning. Coated tips for stone and tool protection.Spring clamps have unlimited uses and can act as helping hands for layout, jigs, guides and repair tasks. They have virtually unlimited uses and are quick and secure.