Belt holder with tension adjustment

This is a Belt holder with tension adjustment. for my new delta printer.

Other Parts: ( one set )
M3 Hex nut 3 pcs
outer Hex Head M3 X 20mm 1 pcs
Inner Hex head screw M3 X 25mm X 1 pcs
Inner Hex Head screw M3 X 40mm X 2 pcs
2020 M3 self lock nut X 4pcs
623ZZ Bearing X 2pcs
M3 x 0.7mm Washer X 5pcs

One printer need 3 sets