Amazon : Oregon 551462 Hydraulic Assist Chain …
Oregon 551462 Hydraulic Assist Chain Grinder. Chains from 1/4-inch to 0.404-inch pitch are easily sharpened thanks to a built-in hydraulic assist that closes the chain vise automatically each time the motor and wheel are lowered, eliminating manual locking and unlocking of the vise as each cutter is sharpened.
