Round Boss Plate This product was suggested to use by Alan Cohen and we agreed that it would be very useful to speed up setting boss plates on stage. A 51mm hole saw will nearly cut through the usual hardboard stage cladding. The hardboard can be discarded and the plate set in the hole. The finish is black powder coated. Size: 50mm diameter x 3mm thick (10mm to base of boss). Fixings needed: Three No.8 or No.10 (4, 4.5 or 5mm) csk wood screws. Weight: 52g.