BEING Dental High Speed Handpiece Air Turbine NSK Phatelus Mach Coupler FM-CL-M4. 302PQ-N QC Quick Coupling (NSK Mach type, No LED, 4 Hole, similar to NSk Mach FM-CL-M4 Coupler). 302PQ-N Handpiece (Non Fiber optic, Big Torque Head, fit NSK Mach Coupler). 303PQ-N Handpiece (Non fiber optic, Standard Head, fit NSK Mach Coupler). 302PQ-N M4 Kit (Non fiber optic Torque Head 302PQ-N Handpiece & 302PQ-N QC Coupler). 303PQ-N M4 Kit (Non fiber optic, Standard Head 303PQ-N Handpiece & 302PQ-N QC Coupler). BEING brand top quality. KaVo MULTIflex NSK Phatelus coupling type. Anti-retraction clean head system. 302 series with big torque head. 303 series with standard head. Head size: 12.513.02mm (302 series big torque head) 10.812.1mm (303 series standard head). Speed: 300,000-380,000rpm (302 series big torque head) 300,000-450,000rpm (303 series standard head). Noise: less than 70db.