... 0 3.Tolerance:+/-0.01mm 4.certification:ISO9001:2008 Plastic Mini WormsBriefly description:1.Module:1.02.Pressure angle :20°3 ... Packaging: Inner packing--Polythene bags, outer packing--Paper cases suitable for transportation by air or sea;8). Competitive price, good quality ... TT/LC before shipment. Services:We offer a complete solution for your gear needs, from various plastic gears,gearboxes ,worms , ...