M4 Lock Nut Set $0.95 Quantity discounts available QuantityPrice Quantity: -+ Add to Cart SKU: HPIZ664 ABOUT THIS PRODUCT:M4 Lock Nut SetAboutAboutSet of four (4) self-clinching lock nuts for the HPI Baja 5b. M4 size. HPI part # Z664. Q&A's:Be the first to submit a Question.Submit your question:Your question has been successfully submitted !Please write a question.