PanaVise is a major manufacture of Vises and Work Holding Tools. PanaVise"s Tilt, Turn & Rotate technology has been applied to the product line, allowing for maximum efficiency and many different uses! All PanaVise Products are covered by a Limited Lifetime Warranty! Introducing the Panavise 391 MICROMETER STAND, Position your micrometer EXACTLY where you need it! A convenient combination, perfect for the workbench. Gently, yet firmly, holds micrometers of all sizes. Can also hold small PC boards and other objects. Delrin pads open 0.5-Inch (12.7mm) and close to zero for holding thin items. Throat depth: 0.95 (24.1mm). Single control knob and exclusive split-ball locks Head firmly in place. Base accepts all 300 series vise Heads. Base features 4.3125 (109.5mm) bolt circle countersunk for three 1/4 (6.3mm) flat-head screws (not included). Limited Lifetime Warranty!