Okw covers for t knobs black 16233140mm white marker line withwithout okw a 50 40 100 this okw a 50 40 100 cover for t knob 40mm black with white marker line is suitable for a spindle shaped knob and has been manufactured with abs ul 94 hb material okw a 50 40 100 cover for spindle knobs 40mm bk w white marker line