3/8"sq. Extension Bar Set (6pcs.)3 8"sq. Extension Bar No. Description NBE3 030 30 mm Extension NBE3 050 50 mm Extension NBE3 075 75 mm Extension NBE3 100 100 mm Extension NBE3 150 150 mm Extension NBE3 300 300 mm Extension *Made in Japan Magnificent form for excellent torque transfer Elegant form was created by stress analysis. This form prevents twisting stress from being focusing on one particular point. This achieves excellent torque transfer and smooth feeling during use Product