Original authentic German cooling fan R2E180-AT06-15 100W, need reservation, please inquire with me - AliExpress
KOWOOD Countersink Drill Bit Set of 3 Pieces 5/16" Round Shank with Adjustable Depth Stop. (Including: 2 Wrenches, 3 Small Screws, 1 Large Screw and 12 Wood Screws) - Amazon.com
Amazon.com: HRSTAR para ventilador inversor Empapst R2E190-AO26-30 AC 230V 80W 2700RPM M2E068-BF : Industrial y Científico
ISO metric screw thread - Wikipedia
Ebm-Papst 225x99mm 230V 200W Centrifugal Blower Fan R2E225-BD92-09 – Primelec