The 9508 series is a full bar metal bond diamond for use with National's Helix and 8274-4 planetary concrete grinders.  This tooling is available in a soft and medium bond diamond matrix and is meant for use on MEDIUM to HARD concrete for the removal of sealers. 

When using this tooling style with your Helix planetary grinder, attach the segments to the direct drive plate on the outer ring of the grinder head, set your dual-speed grinder to 'low', and remove weights.  After making an initial 3-5 foot pass, decide if you need to increase head pressure with more weights, or turn up the speed on your grinder.

9508-16SB (16-Grit, Soft Bond)

9508-16MB (16-Grit, Medium Bond)

9508-30SB (30-Grit, Soft Bond)

9508-30MB (30-Grit, Medium Bond)

9508-50SB (50-Grit, Soft Bond)

9508-50MB (50-Grit, Medium Bond)

The 9508 tooling is sold individually. To build a complete set for your grinder you will need to purchase 6 - #9508-__.