The Model 301 Standard Vise is the original work holding tool for hobbies, electronics, small home repairs and work bench environments. The easy-to-use single knob controls head movement through 3-planes 90 deg. Tilt, 360 deg. Turn and 360 deg. Rotation. The jaws are 0.5" Tall x 2.5" Wide and opens to 2.25". Designed with Nylon Jaws which offer excellent electrical insulation and gentle holding power. The Nylon can withstand continuous heat up to 200 deg. F and can tolerate intermittent heat up to 300 deg. F. Interchangeable Jaws are available (Models 343, 344, 352, 353 and 354). The base features a 4.3125" bolt circle countersunk for three, 1/4" flat-head screws (not included). The Model 301 Base accepts all 300 series Heads and any 5/8" diameter shaft.