重量:目前工具的轻量化以十分流行，越来越多的工人们意识到轻量化的重要性，不仅可以让自己有更长的工作持续性，还可以减少劳动伤害，特别是对于连续高强度工作而言，即使是100g差距也是非常明显的。
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.
转速：转速是在单位时间转的圈数越多拧的越快，但前提是满足扭矩要求。
Speed: The speed refers to the faster the number of revolutions per unit time, provided that the torque requirements are met.
扭矩：足够大的扭矩余量可以显著提高工作效率，道理如同大马拉小车自然跑的快，还有就是足够宽扭矩范围，可以让工人在工作中灵活应对不同规格的螺栓，一机多用可方便管理和使用，这对整体效率而言也是有足够的积极影响的。
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.
寿命：寿命对效率的影响就是减少因故障而产生的停工，对工人而言工具故障不但会打乱原有的工作计划，而且维修起来费时费力，对于施工方而言停工的成本更是可观，设备租赁、人员工资、资金利息……，
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,
一款好的扳手要满足“三高一低”,即高转速、高扭矩、高寿命、低重量。但实现以上几点绝非易事，因为这四点是相互关联相互制约的，比如说轻量化往往会造成寿命降低；电机功率不变的前提下提高速度，扭矩就会降低；提高电机功率往往又会增加重量；重量不变的前提下提高扭矩寿命会随之降低。
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.
