The slide vice block is designed to facilitate the servicing and maintenance of slides. To use, simply insert the block into the frame rail grooves of the slide. Once positioned, mount the assembly onto the jaws of a vice. Carefully tighten the vice jaws around the slide vice block until the slide is securely held in place. It is important to avoid overtightening to prevent damage. A vice block designed to secure Glock slides onto a vice, facilitating easier maintenance and servicing of the slide To effectively secure the slide onto the vice jaws for replacing the rear sight on the slide: Place the slide vice block into the frame rail grooves of the slide-and position it within the vice jaws Slowly tighten the vice jaws around the slide vice block until the slide is firmly held in place Avoid overtightening the vice jaws