This small knurled aluminum knob puts the perfect finishing touch on your amplifier or other project. Standard vintage design measures 0.5 diameter x 0.5 height (13 x 13 mm). Set screw for use with 6 mm shaft; white indicator arrow. Small Aluminum Guitar / Amplifier Knob 0.5 - Black This small knurled aluminum knob puts the perfect finishing touch on your amplifier or other project. Standard vintage design measures 0.5 diameter x 0.5 height (13 x 13 mm). Set screw for use with 6 mm shaft; white indicator arrow. Maybe you re repairing restoring or hot rodding an existing guitar amplifier or other electronic equipment. Perhaps you re devising your own unique musical or audio gear from scratch. Any way you slice it Parts Express has the quality components you need to finish the job right at prices you can afford. Product Details BrandParts ExpressPart Number240-2210UPC848864029474Unit of MeasureEachWeight0.05 Product Specifications ColorBlack