Big Horn Brass Template Guide Lock Nut is designed to provide a reliable and easy-to-use solution for installing template guides when creating controlled cut patterns. This lock nut replaces the Porter Cable 42237 and features a knurled surface that allows for quick hand tightening, making adjustments simple and efficient while working with your template guide. Crafted with precision, this brass lock nut ensures stability and accuracy during your woodworking projects, helping you achieve professional results with ease. Model Number: 19667