This serious contender is becoming very popular. The body is made of chrome vanadium for strength and durability.The fine adjustment threads are precision cut and offer smooth adjustment and can be adjusted to suit the work. Stays adjusted for repetitive work.The American style release lever does not protrude past the handle which eliminates bumping and accidental release of the tool whilst in use.The locking action is firm and positive and the locking lever weight is not compromised. Heat treated and zinc plated.