TECHNIKS SIMIS CAT40 BALANCED 1" END MILL HOLDER X 1-3/4" LENGTH CNC TOOL,Techniks Inc." /> Our Part # TEC-CAT40SLN1-1.75 1" Diameter CAT40 end mill holder x1.75 length (L1 dimension on image #2) This is the best tool holder value in the industry. Proven performance on Haas, Fadal, Mazak, Mori Seiki, Kitamura, Hurco, and many others. Balanced to 8,000 RPM's. Taper ground to high precision AT3 accuracy and H7 Bore Tolerance (all meeting or exceeding industry standards)