THIS JACOBS 34-06 BALL BEARING CHUCK FEATURES A 6 TAPER AND IS EQUIPPED WITH AN R8 HOLDER. IT OFFERS A CLAMPING CAPACITY RANGING FROM 0 TO 1/2 INCH (0 TO 13MM). THE OVERALL LENGTH OF THE ENTIRE PIECE IS 8 INCHES. THE CHUCK IS A RELIABLE PIECE OF DRILL TOOLING DESIGNED FOR PRECISION APPLICATIONS.