Hi David, Once you have used a Robertson screw you will throw away any others you have been using. They fit firmly on the "bit" and obviate the need for "screw holders". They save time and effort work very well in power drivers. At 11:28 PM 1/19/2007 -0800, you wrote: >That's funny...I got their catalog today...what is advantage of the square drive screws? I would guess 4 bearing sides...? > >David Ilvedson, RPT Regards, Don Rose, B.Mus., A.M.U.S., A.MUS., R.P.T. Non calor sed umor est qui nobis incommodat mailto:pianotuna at yahoo.com http://us.geocities.com/drpt1948/ 3004 Grant Rd. REGINA, SK, S4S 5G7 306-539-0716 or 1-888-29t-uner
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