Compact black drum wrench designed for safe, convenient tuning and assembly of drums. Key benefits Size and color: compact 5.5 x 4.9 cm tool in black for easy handling and storage. Compatibility: fits square tuning sockets with an inner diameter of about 5.5 mm or 2.17 inch. Safe to use: smooth, rounded edges protect your hands during repeated use. Improved grip and leverage: thickened, widened head makes it easier to change drumheads and turn tension rods. Portable and lightweight: small size and low weight for easy transport and onstage use. Functions and attributes Primary function: drum wrench and tuning key for tightening and loosening drum tension rods. Practical design: smooth contours reduce hand fatigue and prevent snagging while tuning or assembling drums. Size detail: overall dimensions 5.5 x 4.9 cm, color black, suitable for routine tuning and maintenance tasks. Use scenarios Live performance: quickly retune toms and snare between songs with a comfortable, secure grip. Drum maintenance: remove and drumheads during setup or without hand discomfort. Transport and setup: keep in a kit bag or toolbox for onsite drum assembly, tuning, and adjustments. This compact drum key provides straightforward compatibility and an ergonomic shape to make tuning and drumhead changes faster and more comfortable.