Columbia Outside 90 for 325 No-Coat Grooved Mud Head Corner ApplicatorProportionate grooves give you a consistent mud distribution on the 90 degree outside angles and speeds up the pre filling process. Made out of UHMW, the strong durable design makes these Mud Heads the best on the market. Features: OA90 325 Outside 90 angle for 325 No Coat Quick release clip Channeled grooves for evenly dispersed mud and controlled flow Long lasting, durable and strong Machined using top quality Ultra High Molecular Weight materials