This NSK 90° Angle Torque Attachment for the Espert 500 system comes with a ø1/8" Collet Chuck. This NSK attachment is perfect for corner work and grinding the inside of cavities and restricted areas. • Speed Reduction Ratio: 1/1.5 • Collet Chuck Standard Size: ø1/8" (CHS-3.175) • Weight : 3.77 oz. • NSK Catalog Number: ES41551 Includes: • Collet Chuck ø1/8" (CHS-3.175): 1 pc. • Wrench (8 x 5), (7 x 5.1), (20 x 24) : 1 pc. each