3 pcs Leather Craft Carving Working Kit Hand Groover Punch Wheel Roulette Tool1. Hand Groover The Hand Groover is an essential tool in any leatherworker's arsenal. It allows you to create clean, precise grooves in your leather, which not only enhances the aesthetics but also serves practical purposes. Using a Hand Groover: Aesthetic Appeal: A grooved line can add decorative flair to your leather project, making it stand out. Functional Use: Grooves create channels for stitches, ensuring that your threading is straight and even.