• Material: HSS
• HRC 58-62
• 1#: Drilling size 3mm, extraction range 3-5mm
• 2#: Drilling size 3.5mm, extraction range 4-8mm
• 3#: Drilling size 4mm, extraction range 5-10mm
• 4#: Drilling size 6mm, extraction range 6-12mm
• Packing: double blister