If an insert dulls or gets nicked, simply rotate it to expose a new sharp edge. No need to take out all the blades for sharpening or replacement like before this upgrade. Including: 12-1/2-Inch Cutterhead (Bearings Pre-Installed), 61 carbide inserts(SIZE:15x15x2.5mm-30°-R150), 61 PC screws, two T wrenches. FOXBC spiral cutterhead keep your for DeWalt DW734 planer cutting cleanly for the best results. And also offer replacement carbide inserts sale on store.SECURE & HASSLE FREE SHOPPING. All our sales are backed by a 30-Day Satisfaction Guarantee.