Slotted tubes are made from stainless steel which is more durable than plastic. Built in a convenient "spider" design so the most popular sizes are always available.
Lisle 56500 Terminal Tool
Tool Aid 18550 3 Piece Steel Deutsch Terminal Release Tool Kit
Tool Aid 18550 Deutsch Terminal Electrical Connector Release Tool Kit
Sg Tool Aid 18550 3 Piece Steel Deutsch Terminal Release Tool Kit
Thexton Deutsch Terminal Removal Tool for 20 gauge wire
JRready Deutsch Terminal Removal Tool DRK-16DT, Black Or Blue