Platen: light and convenient, good toughness, will not scratch any material, durable. Milling engraving machine arc pressure plate fixture fixture plate router T-slot workbench T-screw: high standard, high precision, easy to use, and the thread is not easy to deform. Angle adjustment nut: good material, high toughness, no damage to building materials. Wing nut: butterfly-shaped, easy to screw, not hurting hands, easy to use. Round Spacer: Extends the life of the wing nut. Package content: 4* engraving machine platen plywood