Project Kics R40 Composite 20pc Lug Nut Set. 12x1.25mm Neo Chro. Non Locking. Super light-weight thin-wall construction using strong light-weight OEM quality materials. Oversized and taper seat to ensure best contact. External drive by popular 17mm hex for easier installation. Full stud engagement and can accommodate long racing studs. Reliable and stronger than aluminum racing nuts. Japan patented (No. 1192260) and USA patent applied. Lug body produced by Cold-Forged SCM-435 material. Attached rotating taper-seat made with A7075-T6 aluminum and ultra-hard alumite finish.