uxcell Plastic Head Knurled Clamping Knob Jig M6x30mm Male Thread 10pcs Black Product Name : ClampingKnob;Type : Screw On Head Diameter : 22mm /0.87";Thread Size : M6x30mm/0.24"x1.2"(D*L) Total Height : 44mm /1.7";Material : Metal,Plastic Color : Black;Weight : 123g Package Content : 10 x ClampingKnob