Manual mode:Fast and efficient,Highlight professionalism everywhere,Continuous one-way rotation action Electric drillmode:The electric drill needs a torqueprotection mechanism,Otherwise improper operation,It's easy to hurt your hands Quick replacement of the expansion head: flexible card slot, easy to replace the expansion, gently a card a twist can be With positioning scribing control size: control horn depth size can be standard size 45 degrees eccentric cone ring multi-pass bearing: multi-pass bearing to ensure smooth operation of the product, with dust jacket For high-value items, customs clearance in your country requires your cooperation; please be advised. Welcome and I wish you a happy life, my friend., Manufacturer: DCDCD