ER16 Collets The ER16 Collet system also known as RD16 Collet system are standardized and manufactured as per DIN 6499 standard guidelines and are truly interchangeable. This becomes important to users that may have toolholding systems from different Toolholding System Manufacturers. Lexis ER16 Collets are designed to collapse with 1.0mm or .0039 inches. Sealed Collets for coolant through applications do not have a collapse range, and must be used at exact size. Collet Sizes Lexis ER16 metric sizes starting from 1mm Dia to 10mm with 1mm incremental. Collet Dimensions ER 16 Collet dimensions:- A=17mm & B=27mm Lexis ER 16 Collet RD16 Collet ER16 Collet ER Collets ER16 Collets ER16 Coolant Collet ER16 Sealed Collet ER16 Tap Collet ER16 Tap Sealed Collet