What You Get- Router Collet Chuck Extension for ER25 Collets Size- Shank Dia: 25mm / 0.98 " ; Shank Length: 100mm / 3.9" Material- 20CrMnTi material, toughened and precision ground,high quality material, durable and practical to use. Feature- Milling lathe collet chuck holder, straight shank, clamping nut,make you work better, more efficient, more durable processing products. International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions., Manufacturer: Utoolmart