HSS (2.35 mm shank)
For a better distinction regarding application and property here the differentiation between WS, HSS and WS diamonded by BUSCH:
Material name properties
WS Tool Steel Twist Drill
• universally applicable
• optimal for gold and silver
• high flexibility
• recommended speed 1,400-10,000 rpm
• Shank diameter 2.35mm
HSS HSS twist drills
• ideal for hard metal alloys, gold & silver(High speed steel)
• high heat resistance
• Recommended speed 1,400 - 10,000 rpm
• Shank diameter 2.35mm
WS Diamond-coated twist drill
• Diamond grain, electroplated diamond-coated
• ideal for glass and gemstones
• high longevity
• Recommended speed 5,000-8,000 rpm with coolant
• Shank diameter 2.35mm
