This parts is attachment for QuadFusion to a delta printer.
What is QuadFusion ? Dev & Sold by M3D
It is made to attach to the arm and effecter using M4 screws.
Please disassemble the head once to connect the QFH and the effector. And add a nut like the photo.
M3 × 12 --- 2pcs
M3 Washer - 2pcs
M3 Nut --- 2pcs (option)
M4 × 20 --- 6pcs
M4 Nut --- 6pcs
Designed with Fusion 360. It is possible to change with reference to f3d.