Abstract: A neuro-drill stencil trainer for demarcation of drilling on flat and curved bones comprises: i) one flat stencil which further comprises: a flat base (5), outer region (1), inner region (2), four slots (3) to define constrained region for drilling procedure, a handle (4) placed on the center region, to firmly hold the stencil at stationary position and ii) one curved stencil further comprises curved base (6), outer circles (7), inner circles (8), slots (9) and handle (10).