metal bats for youth baseball I find are better in that they can be cleaned if there is no tape on the handle. And the knob part can be a hell of a G spot toy! So to which end your wench should take... Well see thats the fun part!  as for the vibrater on the bat part. Again depends on your wench and how well she responds to vaginal vibrations.  I have found , that its more fun to do the clit and surrounding areas. just be sure to use PLENTY od good lub and be patient with her. As to dept of penatration... just use a good perm marker when she has said shes filled . then you now have a reference mark to either gently push to or beyond at times.