This Auto Fixing Torque Wrench Socket Adapter Set includes 3 pieces of Drive Torque Wrench, 3 pieces of Non-Marring Lug Flip Impact Socket, 2 pieces of Magnetic Spark Plug, 3 pieces of Socket Extension Bar, 3 pieces of Sockets, 2 pieces of Universal Joint and 16 pieces 25mm S2 bits. Just set the desired torque and lock the knob and hold, it's very easy to use. When the preset torque value is reached, a "click" sound will be heard.