Will this be ok for trex/composite?

Yes, this will work with those materials.

what size do I need to screw 2by4?

When working with a 2X4 that is 1 1/2" thick you will want to use the 2 1/2" length screws.

Will these work to edge join 5/4 deck boards and can i use the foreman to drill the holes or do i need the HD jig?

For 1" thick lumber, you will want to use the 1-1/2". The Foreman does not have a setting for 1". You could use the 3/4" setting and the 1-1/4" screw and you will still get a good strong joint.

the picture says 1 1/4, are these 1 1/2 or 1 1/4?

Mine say 1 1/4 inch and that's what they measure. The page you are looking at shows where you can order 1 1/4 or 1 1/2 inch sizes, but in my experience the size on the box is the length of the screw.

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Kreg SML-C150B-100 Blue-Kote WR Pocket Screws - 1-1/2-Inch,

Product ID: 275098852

Details

Exterior finish
Alloy Steel
Head style
Square
Item dimensions L x W x H
5.1 x 7.6 x
Material
case hardened
Point style
Self-Drill

🔩1.5-inch precision length

⚙️Square drive for slip-free fastening

🛠️Case hardened steel strength

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28950CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Screw like a pro — join with confidence, build with pride!

MAXI LOC WASHER HEAD - Engineered for standard Kreg pocket holes, delivering professional-grade fastening performance.
TIGHT SEAMLESS JOINTS - Flat bottom head and smooth shank pull pocket hole joints together with unmatched precision.
UNBREAKABLE DURABILITY - Case hardened steel construction resists bending, snapping, or breaking under pressure.
OPTIMIZED FOR SOFTWOODS - Coarse threads designed specifically for pine, plywood, MDF, and particleboard for superior grip.
EFFORTLESS DRIVE ZERO SLIP - Square drive head and self-tapping tip ensure smooth, bit-slip-free installation every time.

The Kreg SML-C150B-100 Blue-Kote WR Pocket Screws are 1.5-inch, case hardened steel screws featuring a square drive head and self-tapping tip for easy, slip-free installation. Designed with coarse threads for softwoods and a flat bottom head for tight pocket hole joints, these screws offer durable, professional-grade fastening with a corrosion-resistant Blue-Kote finish. Perfect for DIY carpenters and pros seeking reliable, long-lasting wood joinery.

Specifications

ASIN	B0020ZT8QU
Brand	Kreg
Compatible Groove Diameter	1.5 Inches
Customer Reviews	4.8 4.8 out of 5 stars (682)
Drive System	Square
Exterior Finish	Alloy Steel
Fastener Size	1.5 in x 3 in
Finish Types	Blue-Kote
Head Type	Flat
Item Diameter	1.5 Inches
Item Dimensions	5.1 x 7.6 x 12.7 centimeters
Item Weight	277 g
Manufacturer	Kreg
Material Type	case hardened steel
Metal Type	Alloy Steel
Model	SML-C150B-100
Number of Pieces	100
Part Number	SML-C150B-100
Screw Head Style	Square
Screw Point Style	Self-Drill Point
Set Name	100
Set Screw Thread Type	Coarse
Thread Coverage	Partially Threaded
Thread Style	coarse partially threaded
Thread Type	UNC
UPC	647096415044
Unit Count	100.00 Count

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