Item Type: Guitar Tuning Pegs Buttons Material: Plastic Colour: Pearl White Package List 12 x Handle 12 x Screw 12 x White Washer 12 x Black Washer Only approximate size for this tuning knob mounting hole for reference, can not be totally exact.Only the approximate for reference. Customers can be be sure if this mounting hole is too big to install according to this size. But if the mounting hole is too small for you, would be hard to fit in. If so, please enlarge the hole with small file. So that this problem can be saved. Please check all very carefuly before order. Thanks for your cooperation. 1Plastic Material: The guitar tuning is made of excellent plastic material, which is sturdy and durable and can be used by you 2Basic Specifications: Guitar tuning has elegant appearance, and the mounting hole size is approximately (L x W) 3mm4mm 3Glazed Appearance: This is a guitar string with glazed appearance, which will not scratch your fingers, is light and durable, and is safe and secure 4Scope of Application: This is tuning button, which is very suitable for electric guitars, folk classical guitars, etc. 5Stable Performance: Tuning knob is odorless, sturdy and durable, stable in performance, and long in service life