This is a Kingmann-White Rapidaptor quick change tooling system for any vertical mill with an R8 spindle. Comes with a great selection of tool holders. Jacobs 2A Chuck – 3/8 Capacity. Albrecht Chuck – 1/2 capacity. 3/16 end mill holder. 3/8 end mill holder. 1/2 end mill holder (2). 5/8 end mill holder. 3/4 end mill holder. Mount for small boring head. Shell Mill Holder with NEW mill. May need a new retaining screw. 2 Machinable blank tool adapters.