The setup blocks can easily set the height of the fence, blades bits and other cutters according to the needs, which is faster and more accurate than using a combined ruler. 9pcs Blocks Solid Aluminum Construction Anodized to better protect router bits and saws. Please note:Slight color difference or difference in kind, does not affect the use, please do not mind, thank you! Colour:Red Material:Aluminum Alloy Package Contents: 9x Blocks Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.