A great addition to your project.

These inserts can be embedded into your project to allow a solid anchoring of screws.

This set of 420 inserts comes in a box and has:

【M2】
M2x4x3.5mm---------------30 pieces
M2x6x3.5mm---------------30 pieces
M2x8x3.5mm-------------30 pieces
M2x10x3.5 mm-------------30 pieces
【M3】
M3x4x5 mm---------------30 pieces
M3x6x5 mm-------------30 pieces
M3x8x5 mm---------------30 pieces
M3x10x5 mm-------------30 pieces
【M4】
M4x4x6 mm---------------30 pieces
M4x6x6 mm-------------30 pieces
M4x8x6 mm---------------30 pieces
M4x10x6 mm-------------30 pieces
【M5】
M5x6x7 mm---------------20 pieces
M5x8x7 mm-------------20 pieces
M5x10x7 mm-------------20 pieces