5Pcs M3 Aluminium Alloy+Stainless Knurled Thumb Screw Hand Grip Knob Step Bolt Screws Red Black White Product Description: Model: Rolling flower hand screw Material : Aluminum alloy Head +Stainless steel Thread hand screw Size: M3 Head Diameter: 12mm/16mm Head Thickness: 15mm/20mm Size description: Eg M3x6-D12x20 (screw diameter M=3mm, thread length L=6mm, handle diameter D=12mm, manage complete top A+B=20mm). Thread length: 6mm-30mm Color: Red/ Black/ Silver Quantity: 5pcs