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THE SPI 75-523 - 3/8" END MILL ADAPTER IS A PRECISION TOOLING ACCESSORY DESIGNED FOR USE IN MACHINING APPLICATIONS. IT FEATURES A CAT 45 HOLDER TYPE, PROVIDING A SECURE AND STABLE CONNECTION FOR END MILLS. THE ADAPTER HAS AN OVERALL LENGTH (OAL) OF 5-7/8 INCHES, ALLOWING FOR EXTENDED REACH AND VERSATILITY IN VARIOUS MACHINING OPERATIONS. IT IS EQUIPPED WITH A 3/8-INCH BORE DIAMETER, SUITABLE FOR ACCOMMODATING END MILLS OF CORRESPONDING SIZE. THE OUTER DIAMETER OF THE BORE MEASURES 1-1/2 INCHES, ENSURING COMPATIBILITY WITH A RANGE OF MILLING MACHINES. ADDITIONALLY, THE ADAPTER OFFERS A PROJECTION OF 2-1/4 INCHES, FACILITATING PRECISE AND EFFICIENT MACHINING PROCESSES.