This drill set is MADE IN INDIA one. Its max 10 mm drill chuck can easily fir in 5 mm shaft dia motor like 775,795,895,997 etc. The connector is with thread easilt fit with 10mm drill chuck. We test every drill cuhck before courier. Use Branded Drill bits like JK company for Easy and smooth Drill. Otherwise it takes for time to drill if you use local drill bits. For 775 ot 795 motor use 12v 5A adapter or 12v 7.2 or more AH battery. For heavy load you can go up to 18v use but current rating should be more than 3.5 A at 18v.