These are the couplers which we use in our workbee cnc machine.
These have two holes for M3 screws and two holes for M4 screws.
You can buy them as spares in case your workbee couplers get damaged.
Our couplers are of very good quality as compared to sub standard couplers which are being sold in the market.
Use only good quality couplers to maintain the cutting performance of your workbee.
Coupler will be provided with M3 SHCS screws x 2 pcs and M4 SHCS screws x 2 pcs (as show in the image)