The Racktime Snap-it Adapter can be used to repair gear rack bags or adapt them to a new set up. The adapter engages with an audible "click" and is easily released with one hand. The width-adjustable adapter fits perfectly on first generation Racktime bike gear racks, even with a spring loaded clamp. The two adjustment options are 8.5 cm and 6.0 cm. The Racktime Snap-It 2.0 adapter is needed for second generation Racktime gear racks. It's not compatible with gear racks from other manufacturers. The system comes with easy to understand assembly instructions and mounting kit and is a great choice for loads up to 12 kg.