
A set earns its place by covering the sizes actually used and keeping them identifiable. Compartment marking speeds selection and makes it obvious when a size is missing or has been replaced with the wrong one. Bits wear at the hex shank as well as the tip, so kits usually include spares of the high-use sizes.
Material: S2 Alloy Steel. It is installed by 1/4-inch chuck on driver or drill.
Build the set around the recess types actually used on site; generic kits often lack the size that matters.
| Material | S2 Alloy Steel |
|---|---|
| Shank | 6.35mm |
| Hardness | HRC60-62 |
| Length | 25mm/50mm |
| Standard | DIN 3126, ISO 1173 |
| Installation | 1/4-inch chuck on driver or drill |
| Typical substrate | multi-size assembly work |
| Key inspections | size verification, shank dimensions, hardness |
Each bit is checked against its marked size, with tip accuracy sampled.We recommend a pilot assembly at the actual torque and mating part before locking the process parameters for volume.