GSS Technologies

A QC (Quality Control) pistol impact screwdriver is used to tighten and loosen screws and bolts with a high level of torque, often in situations where a standard screwdriver or drill-driver would be insufficient. It's especially helpful when dealing with stubborn or rusted fasteners. 

From Katashi International’s catalog: they describe a "Screw Drivers" category designed for increased productivity, accuracy, and durability . These are likely air-powered inline screwdrivers, built for industrial use.

The Katashi SD-04SQC screwdriver is a semi-automatic, industrial-grade tool designed for various applications, including tightening screws and bolts in manufacturing. It features a 9000 rpm no-load speed and a torque range of 80 NM. 

A semi-automatic straight screwdriver, sometimes called a push-pull or ratchet screwdriver, provides an easier way to drive screws, especially in tight spaces or when repetitive tasks are required. It operates with a ratchet mechanism, allowing you to tighten or loosen screws by pressing the handle and the screwdriver bit rotates with each press.