APPLICATION: This screwdriver is used to install or disassemble violin chin rest shaft. EASY TO USE: Insert the wrench into the chin rest screw hole, clockwise pull the wrench to disassemble the chinrest, anticlockwise pull the screwdriver to install the chinrest. HOOK DESIGN: The top of the screwdriver is special bent dealt, which makes it easy to insert the wrench in the violin chinrest screw hole. -RUST: The screw wrench is made of stainless steel metal material, durable and -rust. PORTABLE SIZE: The screw wrench is 65mm in length, and convenient to carry. Material: metal Color: Silver Size: Approx. 6.5 x 1 x 1cm / 2.56 x 0.39 x 0.39inch Weight: Approx. 19g Package List: 1 x Screwdriver Note: The violin showed in the pictures is not included. Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.