Small Controller Box For E-Bike Electric Bicycles And Mountain Bikes, Made Of Size: Small size--- outside dimension:6.57(L)*2.56(W)*2.52(H)inch inside size:5.74(L)*1.81(H)*1.82(H)inch Packing list: controller box*1 fixing clip*2 fixing screw*8 The electric bicycle controller box kit provides 4 fixing screws and 2 fixing clips, which can be installed without other special tools, which is very easy to install and operate. To ensure a smooth installation, please check whether the controller box fits your controller against the dimensional drawing. This controller box can provide good protection for your electric bicycle controller, dustproof and waterproof, and easy to dissipate heat. It is an essential accessory for your electric bicycle. The control box has beautiful appearance and classic design. It is made of qualified plastics and materials, strong and durable, and can be very coordinated with your electric bicycle after installation If you are not satisfied with the products you have received, you can send us an email at any time. We will reply to you within 24 hours and help you solve the problem.