| Bit Type | Size | Driver Diameter (approx) | Fits into screw? | Recommended? | |----------|------|--------------------------|---------------------------|---------------| | T20 | 20 | 3.94mm | T20 screw: Yes TX20 screw: Loose | No (for TX20) | | TX20 | 20 | 3.94mm (unique geometry) | TX20 screw: Yes T20 screw: Jams | No (for T20) | | T25 | 25 | 4.50mm | Neither screw (too big) | No | | TX25 | 25 | 4.50mm | Neither screw (too big) | No |
: Both have a point-to-point dimension of approximately 3.84 mm . difference between t20 and tx20
The "T" in T20 stands for , the original brand name for this hexalobular internal drive system. Some manufacturers and retailers, such as those on Wikipedia , use the "TX" prefix to denote the same sizing standard. T20: The standard designation found in most tool kits. | Bit Type | Size | Driver Diameter