Locks both wheel and swivel Ball bearing equipped in both swivel and wheel to provide maximum smooth movement Front rubber bumper protects from impact Large brake lever and indicator for easy operationWARNING: This product can expose you to chemicals including chromium (hexavalent compounds), which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65WARNINGs.ca.goWARNING: This product can expose you to chemicals including Toluene diisocyanate, which is known to the State of California to cause cancer. For more information go to www.P65WARNINGs.ca.gov.