Hollow and solid handles with an improved design that features enhanced tactile grip knurlings. Hollow: 8mm diameter, 20 Gm.; Solid: 6.5mm diameter, 27 Gm. DH #2 Octagonal handles were designed by Dr. Stan Hoovers. They are lightweight hollow handles with space for color rings for easy identification. 6.5mm diameter, 21 Gm. Gracey Longs are designed for pockets deeper than 5mm.