SINJIN manufactures tools for machining of lenses (modules) demanding high precision such as those of mobile phone camera, black box, telescopes, and medical devices in developing optical industries. The company also supplies ultra-precision diamond tools guaranteeing customer-tailored design and high quality.

Ultra-precision machining, through varying depending upon shape, size and material of workpiece, is defined as machining with dimensional tolerance of 0.005 to 0.01 μm, surface coarseness of 0.001 μm Rmax, and shape precision of 0.05 to 0.1 μm in ultra-precision machining by making use of single crystal diamond tools.