ITEM NAME:Bicycle Screws Bolts Gauge Size Measurement Tool Calliper M3 M4 M5 M6 M8 M10 ME Description: - Handy measurement tool for accurately identifying different types of screws/bolts/ nuts about their diameter, size, pitch, and length - Especially designed to measure bicycle screws/ bolts - Measurement Range: M3 M4 M5 M6 M8 M10 75MM - Made of very durable hard acrylic - Do it yourselfers, handymen, and mechanics can save time, money and a trip to hardware store Specification: - Material: Acrylic - Size: 83x42mm/3.27x1.65 inch - Color: Black Package includes: 1 Piece Screws Measurement Guage.Material: Acrylic.