Techniks 08325-04.0 | 25.00mm Diameter x 3.50mm - 4.00mm Capacity x 4.00mm Shank ER25 Bearing Steel Sealed Coolant ColletTechniks mission is to provide high quality and innovative solutions that optimize manufacturing processes for customers engaged in metalworking, composites machining, and woodworking to meet the most challenging applications, improve machining processes, and create cost efficiencies. Techniks Rubber Sealed Collets are compatible with any standard ER, RD, DR, ESX, or BR Collet Chucks for coolant thru tool applications. Rubber Sealed Collets perfect