Octagonal Mortice/Rim Knob SetThe octagonal mortice rim knob is part of the blacksmith range of knob sets. They are supplied with loose collars to ensure they can be flush fitted to doors or alternatively used in conjunction with a rim lock or mortice lock. The From the Anvil Octagonal Mortice Rim Knob Set comes in a variety of sizes and is polished to an immaculate finish. They come complete with a brass ring for the head fixing which can be screwed onto the door with a screw gun.