Usage Tips:D Key are made of chrome-plated steel construction. Industry standard for all d s with 1/4 inch socket square tension rods Includes 3 standard d keys, and 1 continuous motion speed d key Perfect for all d s with standard 1/4 inch socket square tension rods. The spinning camber design of the continuous motion key makes it Perfect for quickly and easily removing and replacing d heads. d keys made of chrome-plated steel, and are fit for all d s with standard 1/4 inch socket square tension rods whether electronic d kit or traditional d kit. This economical bundle includes 2 standard d keys and 1 continuous motion speed d key. Save you money, 4 d keys for the price of one. The spinning camber design of the continuous motion key makes it Perfect for quickly and easily removing and replacing d heads. Color: Silver Quantity: 4 PCS Material: Chrome-Plated Steel Packing size: 12*8cm package included: 3 x Standard D Key 1 x Continuous Motion Speed D Key Only the above package content, other products are not included. Note: Light reflection 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.