Dotco 12-10 Series Inline Grinders, 300 Series Collet feature durable and ergonomic composite housing. Dotco 12-10 Series Inline Grinders, 300 Series Collet are also compact in size for ultimate control and easy access to confined areas. Dotco 12-10 Series Inline Grinders, 300 Series Collet are ideal for die and mold work and for deburring. Dotco 12-10 Series Inline Grinders, 300 Series Collet are available with a wide selections of speeds and are equipped with a lock-off lever.