If this is more expensive than the R3 and clamp separately and the clamp is smaller why get this kit?

Because with this kit you become irresistable to women, your beard becomes the envy of lumberjacks and your dog can jump 4 feet high on two legs. Who would not want all of that?

Do you have to use their screws with this tool or can you use regular wood screws you buy at any hardware store?

I vehemently dislike the Kreg style pock hole screw (which are "modified truss" head screws) for the simple reason that I dislike square drive screws. There are other manufacturers which offer pocket hole style screws but with a No. 7 or 8 torx drive (T15 size). These are much more user friendly than square drive screws which require the drill driver to be perfect aligned with the screw otherwise the square becomes rounded out. The torx drive screws allow for some wiggle room with the alignment won't damage the screw head.

What is the primary difference between the R3, R4, & R5 units and which would be better for an advanced cabinet maker?

If you build cabinets, furniture or any think to do with joining wood the one I would recommend is the K4 or K5. The K5 is the newer version which incorporates some innovative additions. The other jigs in the system are more portable, but a lot slower to use. The K4 is perfectly adequate for my shop. Buying the kit and the "briefcase" of screws will get you up and rolling fast. The video is very enlightening. Good luck. The R3 Jr. is fine for casual use and some specialty uses as explained in the offering but if you do a lot of woodworking with Kreg the K4 & 5 are more accurate and repeatable.

If I remember right it came with roughly 5 packs of different size screws with 10 screws in each pack. I bought the multipack of screws that comes with a case for $20 and I like it. It gives options and a nice case. If you need more screws you can buy them at Home Depot 100 packs for about $5. The screws are specific to thickness of wood. Also they have fine thread for hard wood like oak and coarse thread for soft wood pine and Doug fir. I've used the fine thread on pine when I have to screw close to or into a knot.

Manufacturer	Kreg Tool Inc
Part Number	R3
Item Weight	1 pounds
Product Dimensions	8 x 2.25 x 5 inches
Item model number	R3
Is Discontinued By Manufacturer	No
Size	Pack of 1
Style	Jig System
Material	plastic
Item Package Quantity	1
Measurement System	inch
Included Components	6" (152mm) Driver Bit, Allen Wrench, Compact Carrying Case., Depth Collar, Kreg Jig® R3, Clamp Pad Adapter, Owner’s Manual, Pocket-hole Plug Set, Starter Kreg® Screw Set, Stepped drill bit
Batteries Included?	No
Batteries Required?	No
Warranty Description	Solid metal drill guide insert assures a clean, accurate pocket hole. Hardened steel drill guides support the drill bit and feature a LIFETIME WARRANTY! 30 day complete satisfaction guarantee

Kreg R3 Jr. Pocket-Hole Jig System - Portable Kreg Pocket-Hole Jig - Easy Clamping & Adjusting - Includes Positioning Sliders - For Materials 1/2" to 1 1/2" Thick

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