Hand-operated disc brakes are offered as an option on a line of heavy-duty carts. When added to the supplier’s four-wheel and six-wheel carts, the disc brakes stop the cart and also function as a parking brake during loading or at the assembly line. A hand lever operates the disc brakes, which are applied when the operator pulls back on the lever in a squeezing motion. To engage the disc brake as a parking brake, the operator pushes the hand lever forward to hold the cart in place without a foot brake. Topper Industrial, 800-529-0909, www.topperindustrial.com.