with collet up to 6mm / 0.25in drill diameter
for drill-chuck up to 10mm / 0.375in drill diameter
for wood-drills
with threaded shaft 10mm / 0.375in drill diameter
Drill spindles are optional available with a collet, a drill-chuck or a threaded spindle-shaft for wood-drills.
The spindles are completely sealed; exhaust air canot escape, nor can contamination from the outside penetrate.
They can be operated without lubrication at an approximate 15% power loss.
Due to general valid physical principles, lubrication naturally improves the spindle's lifespan and operational-behavior.
In both cases a corresponding air-preparation is essential, such as moisture-removal, filtration and if necessary lubrication.
The exhaust-air guidance over an exhaust-hose is always to be recommended as a meaningful supplement.
Stationary Drill-Spindles
Catalog D6400 now contains the former D1016. 
PDF - Catalog : German