TTC ER20 Protective Collet Tray - Model : SAER-20-40 40 Collet Capacity Go to amazon.com Related posts Top 5 best er20 collet rack for 2022 FeatureSliding see through plastic cover protects collets from chips and debris.Tray holds up to (40) ER collets. DescriptionA unique self-releasing system is built into the collet & clamping nut to eliminate cutting tools sticking in collets