Concept: Harmonise Knurled Radio Knob on Backplate. Availble in two backplate options of 40mm x 40mm, or 76mm x 40mm. These knurled Radio knobs on backplate are available in 5 big trend finishes, manufactured from solid brass, each piece is precision engineered to add texture to an iconic industrial design. Works perfectly with various interior design styles including industrial, modern, transitional, and contemporary. Matching cupboard pull handle and knobs available.