The HSK 63 F is a tapered tool holder design and is the Standard next to ISO 30 Tapered holders for most modern cnc machines. The taper is 1:10 and spindles receive the taper and pull the chuck tighter into the spindle with a flange that makes the connection between the spindle and the chuck. The toolholder accommodates three different collet styles: ER32, ER40, RDO35/SYOZ25. ER 32 tool holders have a shank capacity of up to 3/4" or 20mm. ER 40 and SYOZ25 tool holders have a shank capacity of 1" or 25mm. All toolholders are sold with a ball bearing collet nut that facilitates both RH and LH rotation. Holders are balanced to 24,000 RPM at G2.5