Tools No. 901 and 903 form semi-circular corrugations at 9mm centres. For additional grip on steps.
Tools No. 904 and 905 form an 8mm x 16mm recess that can be filled with non-slip grit.
Groover that forms an 8mmx16mm recess
Number of grooves
2 at 19mm apart
140 x 65 x 100mm