Engineering hinge; material for engineering plastics, specifications are: side length of 40 * 30 (two-hole distance 20 * 14) .40 * 40 (two-hole distance 25 * 25) 47 * 48 (two-hole distance of 30 * 30) .52 * 44 (two-hole distance 30 * 24) .60 * 45 (two-hole distance 33 * 25) * 50 .62 (two-hole distance 40 * 30) 41 * 42, 65 * 65 (two-hole distance), 70 * 50 (two-hole distance 46 * 30) * 80 100 (75 * 50) two-hole distance and other specifications for the election. Triangle nylon hinge: length 130 * height of 60 (from 10). Zinc alloy hinge: Material zinc alloy (black), specifications 6060 # (# 35) .5050 (two-hole two-hole distance distance # 30) .4040 ( two-hole distance 25) three kinds of specifications for the election. Zinc alloy outer teeth Hinge: 60 * 45 (two-hole distance 35 * 24)