重量:目前工具的輕量化以十分流行，越來越多的工人們意識到輕量化的重要性，不僅可以讓自己有更長的工作持續性，還可以減少勞動傷害，特別是對于連續高強度工作而言，即使是100g差距也是非常明顯的。
Weight: Currently, the lightweight of tools is very popular, and more and more workers are realizing the importance of lightweight. It not only allows them to have longer work continuity, but also reduces labor injuries, especially for continuous high-intensity work, even the 100g gap is very obvious.
轉速：轉速是在單位時間轉的圈數越多擰的越快，但前提是滿足扭矩要求。
Speed: The speed refers to the faster the number of revolutions per unit time, provided that the torque requirements are met.
扭矩：足夠大的扭矩余量可以顯著提高工作效率，道理如同大馬拉小車自然跑的快，還有就是足夠寬扭矩范圍，可以讓工人在工作中靈活應對不同規格的螺栓，一機多用可方便管理和使用，這對整體效率而言也是有足夠的積極影響的。
Torque: A sufficient torque margin can significantly improve work efficiency, just like a large horse pulling a small car naturally runs fast, and there is also a wide torque range that allows workers to flexibly respond to different specifications of bolts during work. One machine with multiple uses can facilitate management and use, which also has a positive impact on overall efficiency.
壽命：壽命對效率的影響就是減少因故障而產生的停工，對工人而言工具故障不但會打亂原有的工作計劃，而且維修起來費時費力，對于施工方而言停工的成本更是可觀，設備租賃、人員工資、資金利息……，
Lifetime: The impact of lifespan on efficiency is to reduce downtime caused by failures. For workers, tool failures not only disrupt the original work plan, but also require time and effort to repair. For construction companies, the cost of downtime is even more significant, such as equipment leasing, personnel salaries, and capital interest,
一款好的扳手要滿足“三高一低”,即高轉速、高扭矩、高壽命、低重量。但實現以上幾點絕非易事，因為這四點是相互關聯相互制約的，比如說輕量化往往會造成壽命降低；電機功率不變的前提下提高速度，扭矩就會降低；提高電機功率往往又會增加重量；重量不變的前提下提高扭矩壽命會隨之降低。
A good wrench should meet the requirements of "three highs and one low", namely high speed, high torque, long service life, and low weight. But achieving the above points is by no means an easy task, as these four points are interrelated and mutually constrained. For example, lightweight often leads to a decrease in lifespan; Increasing the speed while maintaining the same motor power will result in a decrease in torque; Increasing motor power often increases weight; Increasing torque life will decrease while maintaining weight.
