HHIP 3900-0651 Collet Chuck Nut, ER-50 B-Type M64 x 2 Er Go to amazon.com Related posts Top 6 best er50 chuck FeatureFits ER-50 Thread M64 X 2.00D(mm) 78 L(mm) 35.5L(mm) 35.5Hardened Tool Steel DescriptionHHIP Tools provides the finest quality tools and their goal remains in providing you highest quality products.