Product Name : Screw Pitch Gauge; Fit for : Whitworth 55-Degree Threads & Metric 60-Degree Threads Pitch Range : Whitworth: 4G, 4 1/2G, 5G, 6G, 7G, 8G, 9G, 10G, 11G, 12G, 13G, 14G, 16G, 18G, 19G, 20G, 22G, 24G, 25G, 26G, 28G, 30G, 32G, 36G, 40G, 48G, 60G, 62G;Metric: 0.25, 0.3, 0.35, 0.4, 0.45, 0.50, 0.6, 0.70, 0.75, 0.80, 0.9, 1.0, 1.25, 1.5, 1.75, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0mm : Metric: 0.25, 0.3, 0.35, 0.4, 0.45, 0.50, 0.6, 0.70, 0.75, 0.80, 0.9, 1.0, 1.25, 1.5, 1.75, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0mm Material : Stainless Steel; Size(Closed) : ~2 5/8 x 1/2 x 11/16"(L*W*H) Professional 55 degree Whitworth and 60 degree metric thread pitch gauges; This pitch gauge accurately measures internal and external screw threads with 52 folding leaves; The leaves are individually stamped with accurately formed thread profiles; Measures screw thread pitches between 0.25 - 6.0mm and 4 - 62 (British Standard Whitworth); For use in the automotive and engineering industry when you need an accurate measurement. Color : Silver Tone; Net Weight : 73g Package Content : 1 x Screw Pitch Gauge Note:Light and differnent displays may cause the color of the item in the a little different from the real thing. The measurement allowed is +/- 1-3cm.