1/2"sq. Extension Bar Set (3pcs.)1 2"sq. Extension Bar No. Description NBE4 075 75 mm Extension NBE4 150 150 mm Extension NBE4 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 strength was improved by N PowerFit for the insertion angle. N PowerFit