Columbia Inside 90 Grooved Mud Head Corner ApplicatorProportionate grooves give you a consistent mud distribution on the 90 degree inside angle 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: Available in Inside 90 angle 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 Machined in