Pro-Series ER-32 Stainless Steel Edm Dividing Fixture (3903-1605) ~ IP68 Waterproof EDM dividing unit. ~ Stainless steel heavy duty, rigid structure, built for longevity. ~ Collet clamping range diameter is 2mm-34mm with 1mm steps. ~ Made in Taiwan ~ Dust-proof and water resistant. ~ Made with high precision double bearings in the structure to achieve higher accuracy, rigidity and stability. ~ Rapidly clamps the workpiece with no need to adjust the center accuracy. ~ ER-32 collects included are 4, 8, 12, 16 & 20mm. ~ Note: ER collets and nut are not stainless steel.