are they made out of steel or aluminum it says both ?

Mine are made of steel. They tighten down without bending. A nice set of hold down clamps.

Are these M6 size bolts/threads?

They certainly appear to be, since the slots are 8.25mm (0.326") and the threaded screw holes very nearly fill the raised slot-filling boss. It would be easy enough to verify by capturing a vendor photo at 45 degrees and scaling it to normalize the length, then rescaling it by 1.414 to account for the angle. You can then simply measure the hole in the photo directly to get its diameter.

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Genmitsu 4PCS T-track Mini Hold Down Clamp Kit, Compatible with 3018-PRO/3018-MX3/3018-PROVer CNC Router Machine

Genmitsu 4PCS T-track Mini Hold Down Clamp Kit, Compatible with 3018-PRO/3018-MX3/3018-PROVer CNC Router Machine

Product ID: 226453378

Details

Brand
Genmitsu
Color
Metallic
Item Weight
0.2 kg
Item dimensions L x W x H
1.97 x 0.79 x
Material
Alloy']
Number of Items
4

📏Compact 50x20x56mm size

🔩Zinc-Aluminum Alloy for durability

🛠️Holds materials up to 30mm thick

KD 5.00

Duties & taxes included

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Description

🔧 Clamp down on precision, level up your CNC game!

COMPACT YET MIGHTY - Small footprint with a powerful grip on materials up to 30mm thick.
UNIVERSAL T TRACK COMPATIBILITY - Versatile clamping for routers, mills, saws, and more—one kit, endless projects.
ROBUST ZINC ALUMINUM ALLOY BUILD - Durability and wear resistance that stands up to intense workshop use.
OPTIMIZED FOR PROFESSIONAL WORKFLOW - Secure your workpiece with confidence and boost your CNC productivity.
PRECISION FIT FOR GENMITSU 3018 SERIES - Engineered slot block perfectly matches your CNC for seamless integration.

The Genmitsu 4PCS T-track Mini Hold Down Clamp Kit is a durable, zinc-aluminum alloy clamping solution designed specifically for the Genmitsu 3018 series CNC routers. Compact yet powerful, it securely holds materials up to 30mm thick and fits universal T-track systems, making it an essential upgrade for professionals seeking reliable, versatile workholding in woodworking and metalworking applications.

Specifications

ASIN	B08H5K2VVK
Best Sellers Rank	#146,835 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #16 in Hold Down Clamps
Brand Name	Genmitsu
Color	Metallic
Customer Reviews	4.4 4.4 out of 5 stars (658)
Included Components	4PCS T-track Mini Hold Down Clamp Kit
Item Dimensions	1.97 x 0.79 x 1.57 inches
Item Type Name	4PCS T-track Mini Hold Down Clamp Kit, Compatible with 3018-PRO/3018-MX3/3018-PROVer CNC Router Machine
Item Weight	0.2 kg
Manufacturer	Genmitsu
Manufacturer Part Number	CP50
Material Type	['Zinc-Aluminum Alloy']
Model Number	CP50
Number of Items	4
Set Name	4
Style Name	Modern
Tensile Strength	300 psi
UPC	816550023853
Unit Count	4 Count

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