These two European made vice guides are fitted with an ingenious quick release feature for rapid re-setting of the jaws. The mechanism is hidden underneath so it is difficult to work out exactly how it operates but take our word for it, it does work and very efficiently too. All you have to do is apply a half turn to the screw and the vice jaws slide in or out in no time. Construction of both models is impressively strong with only steel and cast iron being employed. The overall size of the smaller one (including the protruding handle socket) is 390mm x 175mm with a 24mm diameter screw and a working length of 205mm. The larger vice guide is 550mm x 265mm with a 24mm diameter screw and a working length of 335mm. Lifetime Warranty* If any vice fails due to a material or manufacturing defect it will be replaced free of charge.