Profile grooves 50pcs Bosch 30x30 M4 narrow Grooves for aluminum profile Bosch Rexroth Narrow grooves can be placed from the side and face of profiles Some of the grooves have a positioning screw sizes 17 / 11,2 / 6mm M4 guiding groove 8mm Fits profiles 30x30 ,60x60 ,90x30 ,60x30 Collective packing 50 pieces. Type: Grooved nuts / keyways.