| Type | Length(mm) | Material | Standard |
| KDK40-2 | 110±5 | brass | |
| KDK50-2 | 120±5 | JIS B9911 | |
| KDK65-2 | 150±5 |
| Type | Length(mm) | Material | Standard |
| KDK40-2 | 110±5 | brass | |
| KDK50-2 | 120±5 | JIS B9911 | |
| KDK65-2 | 150±5 |
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Tianbu Industry Area,Haimen City,Jiangsu Province,P.R.China