Genuine Grover Deluxe Classical Guitar 3+3 Nickel Set 6 P17Manufacturers Part Number: 306N Excellence in materials and craftsmanship are the hallmark features of these classic machine heads. The die cast base provides a rigid foundation for the gear and worm, assuring perfect alignment and mesh. The pearloid buttons are attached with a tension screw to provide the feel of your preference. A bearing over the worm shaft provides additional support and enhances the smooth performance. Includes wood screws. All Grover Machine heads carry a lifetime warranty from the manufacturer. Buy with confidence from SportHiTech, an authorized Grover Dealer. All products are factory fresh and in original retail packaging.