None screw hole designs, beautiful and stable. Make of nylon materials, strong and Enduring, not easily deformed. Suitable for frame connection, a 6mm/0.24inch diameter locking hole is required for the vertical panel, and the thickness of plate should be greater than 16mm/0.63inch. Most of it is connecting at a 90 degree right angles, but can also be connecting at a 45 degree obliquely angles. When connecting at other angles, plate thickness should be greater than 18mm/0.71inch. Suitable for use with panel furniture, Unable to see screw holes after installation. Package includes: 50Pcs Woodworking Invisible Connector