The Fingertip Design 38mm Square Crystal Cupboard Knob Matt Satin Nickel will create a modern look and feel on any piece of furniture. The stunning crystal face of the knob makes it stand out with a sparkle! Knob Finish This knob has a modern matt satin nickel finish.  It would be suitable for all types of fitted or free standing furniture in residential situations and is simple to fit and maintain. Cupboard Knob Dimensions The cupboard knob has a 38mm knob diameter and is supplied with appropriate fixing screws.