Mugen closed-type 17mm wheel nuts
Coming from Mugen and made for their line of 1/8th scale buggies, trucks and GT vehicles is a set of closed 17mm wheel nuts. While offering protection to the thread and wheel axle area, the nuts are also of a larger outer diameter, making for more secure wheel fitting and less wheel wobble on high-bite surfaces. The serrated nuts feature a laser-engraved Mugen logo and they come in sets of four.
Source: Mugen [mugenseiki.com]