uxcell M4x15mm Male Thread Screw on Type Round Head Clamping Knob Grip 5pcs Weight: 21g; Product Name: Clamping Knob Main Material: Plastic, Metal; Package Content: 5 x Clamping Knob Main Color: Black, Silver Tone; Thread Size: 4 x 15mm/ M4 x 0.6"(D*L) Total Height: 26mm/ 1"; Thread Pitch: 0.7mm Round Knurled Head Dia: 14mm/ 0.55"