Hi Brian, the grip strip is black walnut, inserted into a 10mm deep trough, the strip itself is about 1mm higher than the tread, and there is a chamfer round both trough and strip. We use these a fair bit, as they help visually when going down the stair, but they also allow us to fix tread to riser with screws, hidden below the strip... hope this helps!
Angus+Mack
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