• Type: M3 (3.0mm Diameter)
• Material: Mild  Steel
• Bolt Length: 15mm
• Bolt Head Style: Slotted & Round
• Pack Quantity: 20 sets.
• Hardness is 2 times higher than copper,10 times higher than aluminium.
• Hexagon angular groove depth of more deep, will not slip and hence more convenient for hand tightening.