Black Bass Drum Head Adjuable Port Hole Handle Tool Kit Hole for Drum

["Main function : Effectively improve the sound quality of the drum bottom and avoid damage to the drum head at the opening.","Material use : Surround port holes with durable silicone and stainless steel to avoid top tearing.","Various size choice : There are three sizes of 4\", 5\", 6\" for you to choose, and equipped with drilling tools to meet your needs for different sizes.","Easy to use : The is convenient and simple, you only need to choose a suitable size pad, fit it on the drum surface, and open the hole according to the size of the opening.","Online service : If you have any qusetions or problems, you can feel free to contact us, we will try our best to solve your problems by virtue of our professional knowledge."]